论文标题
银河经典头孢虫的磁通加权重力 - 露光关系
The flux-weighted gravity-luminosity relation of Galactic classical Cepheids
论文作者
论文摘要
研究了477种经典头孢虫(CCS)的样本,其中包括已在文献中分类的恒星,但可能不是,但可能不是,但可能没有,对477种经典头孢虫(CCS)进行了研究,其中包括477种经典头孢虫(CCS),其中包括恒星(CCS),但可能不是恒星,但可能不是,但可能不是,对恒星的重力 - 露光关系(FWGLR)进行了研究,其中包括已分类的恒星,但可能不是,但可能不是,但可能不是,但可能不是,但可能不是,包括已经在文献中分类的恒星,但可能不是,但可能不是,但可能不是,但可能不是,包括已经在文献中分类的恒星,但可能没有,但可能不是,但可能不是,可能不是,但可能不是,包括已经在文献中分类的恒星,但可能没有。亮度是根据文献摘要的,基于光谱能量分布(SED)的拟合,假设一定距离和发红。磁通加权重力(FWG)取自基于高分辨率光谱的文献中的重力和有效的温度确定。 理论上预测和观察到的FWG与脉动期关系之间存在非常好的一致性,该关系可以在光谱研究中估算FWG(和$ \ log g $),精度为0.1〜DEX。 正如文献中所知,CCS的理论上预测的FWGLR关系非常紧密,对金属性(至少对于LMC和太阳值),旋转速率和不稳定性条的交叉不太敏感。观察到的关系具有略有不同的斜率,并且显示出更多的散射(0.54〜DEX)。这都是由于距离内的不确定性和脉动阶段平均的FWG值。 来自未来的Gaia数据发布的数据应减少这些错误,然后FWGLR可以作为CepheID研究的强大工具。
The flux-weighted gravity-luminosity relation (FWGLR) is investigated for a sample of 477 classical Cepheids (CCs), including stars that have been classified in the literature as such but are probably not. The luminosities are taken from the literature, based on the fitting of the spectral energy distributions (SEDs) assuming a certain distance and reddening. The flux-weighted gravity (FWG) is taken from gravity and effective temperature determinations in the literature based on high-resolution spectroscopy. There is a very good agreement between the theoretically predicted and observed FWG versus pulsation period relation that could serve in estimating the FWG (and $\log g$) in spectroscopic studies with a precision of 0.1~dex. As was known in the literature, the theoretically predicted FWGLR relation for CCs is very tight and is not very sensitive to metallicity (at least for LMC and solar values), rotation rate, and crossing of the instability strip. The observed relation has a slightly different slope and shows more scatter (0.54~dex). This is due both to uncertainties in the distances and to the pulsation phase averaged FWG values. Data from future Gaia data releases should reduce these errors, and then the FWGLR could serve as a powerful tool in Cepheid studies.